package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;

    /**
     * 根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);  //日期计算，获得指定日期的后一天日期
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date:dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("status", Orders.COMPLETED);
            map.put("begin",beginTime);
            map.put("end",endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover ==null ? 0.0:turnover;
            turnoverList.add(turnover);
        }
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 根据时间区间统计用户的数量
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> newUserList = new ArrayList<>();  //新增用户数
        List<Integer> totalUserList = new ArrayList<>();  //总用户数量

        for(LocalDate date:dateList){
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            Integer newUser = getUserCount(beginTime,endTime);
            Integer totalUser = getUserCount(null,endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();

    }

    /**
     * 根据时间区间统计订单数量
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        //处理每天的日期
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //处理订单列表
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            orderCountList.add(getOrderCount(beginTime,endTime,null));
            validOrderCountList.add(getOrderCount(beginTime,endTime,Orders.COMPLETED));
        }

        //处理总数和订单完成率(不需要单独进行处理)
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        Double orderCompletionRate = 0.0;
        if (totalOrderCount!=0){
            orderCompletionRate = validOrderCount.doubleValue()/totalOrderCount.doubleValue();
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime,endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
        String numbersList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ",");
        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numbersList)
                .build();
    }

    /**
     * 根据时间区间统计用户数量
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer getUserCount(LocalDateTime beginTime,LocalDateTime endTime){
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end",endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 根据时间区间统计订单数量
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime,LocalDateTime endTime,Integer status){
        Map map = new HashMap<>();
        map.put("begin",beginTime);
        map.put("end",endTime);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }
}
